Lighting apparatus



Sept. 27, 1927.

I 1,643,697 F. w. CHRISTY LIGHTING nrrm'rus Fi 1ed dot. 29-. 1925 V illPatented Sept. 27, 1927.

UNITED STATES FRANK W. QHRISTY, OF BEVERLY, MASSACHUSETTS.

LIGHTING APPARATUS.

Application filed October 29, 1925.

Tnis invention relates to improvements in lighting apparatus.

The object of the invention is to provide a lighting apparatus orfixture of practical and inexpensive construction, and particularlyadapted for use on benches of factories, machine shops and the like.

The apparatus of this invention is particularly intended for use inconnection with sewing machines. or any kind of bench machines in whichit is desirable for the light from an electric lamp bulb to be directedwithin a certain prescribed area upon the work which is being done, andfurther, it is the object of the invention to provide meansfor-preventing the rays of light from the electric lamp from dazzlingthe eyes of the operator, while at the same time clearly illuminatingthat portion of the work upon which he is engaged.

It is further an object of the invention to provide means which can bereadily operated to adjust the. electric lamp at diiferent heights anddifferent angles so that the rays of light may be directed toward thatportion of the work which is being operated upon.

It has been found in many cases that the workmen or operatives infactories, such as shoe factories, clothing factories and the like, havebeen in the habit of removing the electric light bulb which is suppliedby the company for whom they are working and substituting therefor anelectric light bulb of much greater power. For instance, where it is thecustom for the company to supply bulbs not exceeding 25 watts, theworkmen have substituted bulbs of watts. This leads to a great deal ofunnecessary expense, and where a proper shade is not used, the higherpower lamp is less efficient on account of the glare in the eyes of theoperator. To overcome this difiiculty is one of the objects of thisinvention, and it is accomplished by providing a shade, preferablyflaring at its outer end, and adapted to be clamped to the socket of anelectric light bulb, the shade being of such shape and size as toprevent the insertion in the socket of any electric light bulb.exceeding a predetermined size, and thus preventing the insertion insaid socket of an electric lamp exceeding a predetermined power, such,for example, as 25 watts.

Another object of this invention is to provide an apparatus which may beplaced upon a bench in a factory where there are several machines, suchas sewing machines,

ing a predetermined size.

Serial -No. 65,555.

lacing hook setting machines, or eyelet sett ng machines, and anelectric lamp positloned on said apparatus for each machine which isbeing operated to throw the light in a restricted area upon the workbeing done, and at the same time prevent rays of light from beingdirected into the eyes of the operators. To these ends the inventionconsists in the mproved lighting apparatus, and especially 1n theportions thereof which enable an electr1c lamp socket and bulb to beattached to a support in different positions, and in the improved shadewhereby rays of light from the electric lamp may be directed upon thatportion of the work which is being operated upon, the rays beingprevented from being directed into the eyes of the operator, said shadebeing adapted to engage and prevent the insertion in the socket of alamp exceed- The invention furthermore consists in certain details ofconstruction set forth in the following specification and particularlypointed out in the claims thereof.

Referring to the drawings: Figure 1 represents a side elevation of alighting apparatus embodying my invention. Fig. 2 is an enlargedvertical sectional elevation taken on the line 22 of Fig. 1. Fig. 3 isan enlarged vertical sectional elevation taken on the line 3-3 ofFig. 1. Fig. 4 is an enlarged vertical sectional elevation taken on theline 4-4 of Fig. 1.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings, 5 represents a vertical standard which is mounted atits lower end in a pedestal 6, the latter being adapted to be secured toa desktable or any other suitable supporting member. Mounted upon thestandard 5 is a bracket 7, and said bracket may slide vertically on saidstandard 5 or may be rotated thereon as may be desired and be securedthereto by athumb screw 8.

The bracket 7 embodies therein a circular flanged portion 9 from whichprojects a shouldered portion 10, and rotatably mounted on saidshouldered portion is a friction member 11. Also mounted upon theshouldered portion 10, and located between opposite surfaces of theflange 9 and friction member 11 is a friction washer 12. The frictionmember 11,is forced against the friction washer 12 and the latteragainst the flange 9 of the bracket 7 by a spring 13, the

' projecting flange 23, and formed in said" pressure that is applied bysaid spring against said friction member bein regulated by a thumb screw14 which ias screwthreaded engagement with the shouldered portion 10 ofsaid bracket. Shdably mounted in the rotatable friction member 11 of thebracket 7 is a rod 15 which con stitutes a'supporting arm for the sourceof illumination, and said arm is secured within said member 11 by asuitable thumb screw 16.

A source of illumination, which is preferably an electric light bulb 17and socket 18 of Well known construction, together with a shade 19having a reflecting surface 20 are adjustably mounted upon a hanger 21which is located at one of the extremities of the arm 15. The hanger 21is con-. structed in the form of a band which surrounds the arm 15, theopposite extremities of said band terminating in a pair of ears 22, seeFig. 3. The shade 19 has a cylindrical rear end portion 35 whichterminates at one end thereof in an outwardly cylindrical rear endportion area plurality of slots 24 which extend longitudinally of the clindrical portion from the flanged end thereof. The body portion 36 ofthe shade 19 is of frusto-conical form and terminates at its outer endin an outwardly flared portion 37. Surrounding the cylindrical rear endportion of the shade 19 and located directly beneath the flange 23thereof is a gripping member 25, the latter being constructed in theform of a band and terminating at its opposite extremities in a air ofears 26. The'gripping member 25 1s secured to the hanger 21 by a clampscrew 27 which projects through the ears of said gripping member andsaid hanger, and the gripping member is tightened against thecylindrical portion of the shade 18, causing the socket to be grippedtherein, and the ears 22 of the hanger 21 are forced together,

causing said hanger to be clamped against the arm 15 by a thumb screw 28which has screw-threaded engagement. with the clamping screw 27. A pairof friction washers 29 are interposed between the ears of the grippingmember 25 and hanger 21 respectively, as illustrated in Fig. 3, and thevarious ears and friction washers are all clamped together sufiicientlytight by the screw 27 and thumb nut 28 to errnit the gripping member 25to be IOCkGCF upon the hanger 21 and the latter to be rotated upon thearm 155, said members remaining in any position that they may be'locatedin, relatively to each other and to the supporting arm 15. The electriclamp socket 18 is connected by a flexible electric connection 30 to asuitable switch plug 31.

An auxiliary bracket 32 is also slidably and rotatably mounted upon thearm 15 to which it is secured by a thumb screw 33.

The bracket 32 embodies therein an arm 34 to which the hanger 21carrying the source of illumination and shade therefor may be clamped ifit is so desired in exactly the same manner as said hanger is clamped tothe extremity of the arm 15.

The lighting fixture of this invention is capable of being adjusted toposition the source of illumination and shade therefor in a greatvariety of positions, it being possible to rock the hanger 21, carryingsaid source of illumination, laterally of the sup porting arm 15, or torock the gripping member 25 in which said source of illumination ismounted upon said hang-er. The height of the source of illumination maybe varled by adjusting the bracket 7 vertically upon the standard 5, andthe supporting arm 15 may he slid longitudinally within the frictionmember 11 of said bracket 7, while said friction member may also berotated furthermore, be detached from the extremity of the arm 15, andsaid hanger may be positioned upon the arm 34 of the auxiliary bracket32, and the latter may be positioned as desired upon the arm 15. Theclamp screw 27 and thumb nut 28 are utilized to secure the grippingmember 25 to the hanger 21, tighten said gripping member against theshade 19, thereby clamp ing the socket 18 within said shade and also toclamp the hanger 21 upon the arm 15.

It will be seen by reference to Fig. 2 that the electric light bulb17J-is of such a size as to allow'the bulb to be screwed into the socket18 and. just clear the portion 38 of the shade 19 where thefrusto-conical portion 37 merges into the outwardly flared portion 36 ofthe shade. It will bereadily seen that any electric light bulb largerthan the one shown in Fig. 2 could not be screwed into the socket 18because it would member surrounding said shade adjacent to said flange,and means to simultaneously clamp said hanger to said arm, secure saidshade to said hanger and contract the upper portion of said shadeagainst said socket.-

2. A lighting fixture comprising, in combination, an arm, a hangermounted upon said arm, a socket for an electric light bulb, a shade forsaid socket embodying therein an outwardly projecting flange extendingaround the rear end thereof, said shade also upon said bracket.Thehanger 21 may,

bein provided with a slot extendin i-nflange, and means tosimultaneously clamp war 1y from said rear end and embo ying said hangerto said arm, secure said shade therein a frusto-conical portion adaptedto to said han er and contract the upper por- 1 engage and prevent theinsertion in said tion of sai shade against said socket.

5 socket of an electric light bulb exceeding In testimony whereof I havehereunto set a predetermined size, a band gripping memmy hand. bersurrounding said shade adjacent to said FRANK W. CHRISTY.

